Enrico Fraccaroli
41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
/// @file libc_start.c
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/// @brief Contains the programs initialization procedure.
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#include "sys/unistd.h"
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#include "stdlib.h"
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#include "string.h"
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#include "assert.h"
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#include "system/syscall_types.h"
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#include "sys/errno.h"
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/// @brief Reference to the `environ` variable in `setenv.c`.
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extern char **environ;
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/// @brief The entry point to every program.
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/// @param main Pointer to the main function.
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/// @param argc The number of arguments.
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/// @param argv The pointer to the arguments.
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/// @param envp The pointer to the environmental variables.
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/// @return The return of the `main` function.
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int __libc_start_main(int (*main)(int, char **, char **), int argc, char *argv[], char *envp[])
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{
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//dbg_print("== START %-30s =======================================\n", argv[0]);
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//dbg_print("__libc_start_main(%p, %d, %p, %p)\n", main, argc, argv, envp);
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assert(main && "There is no `main` function.");
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assert(argv && "There is no `argv` array.");
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assert(envp && "There is no `envp` array.");
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//dbg_print("environ : %p\n", environ);
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// Copy the environ.
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environ = envp;
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// Call the main function.
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int result = main(argc, argv, envp);
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// Free the environ.
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//dbg_print("== END %-30s =======================================\n", argv[0]);
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return result;
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}
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// WARNING: This declaration must be here, because libc_start is compiled
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// with all the programs, and all the programs NEED to have the `sigreturn`
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// symbol. It must be this way, period.
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_syscall0(int, sigreturn)
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