60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/* execve() - basic program execution call */
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#include <sys/cdefs.h>
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#include "namespace.h"
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#include <lib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stddef.h>
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#include <minix/param.h>
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#include <sys/exec_elf.h>
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#include <sys/exec.h>
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int execve(const char *path, char * const *argv, char * const *envp)
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{
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message m;
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size_t frame_size = 0; /* Size of the new initial stack. */
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int argc = 0; /* Argument count. */
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int envc = 0; /* Environment count */
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char overflow = 0; /* No overflow yet. */
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char *frame;
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struct ps_strings *psp;
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int vsp = 0; /* (virtual) Stack pointer in new address space. */
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minix_stack_params(path, argv, envp, &frame_size, &overflow,
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&argc, &envc);
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/* The party is off if there is an overflow. */
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if (overflow) {
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errno = E2BIG;
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return -1;
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}
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/* Allocate space for the stack frame. */
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if ((frame = (char *) sbrk(frame_size)) == (char *) -1) {
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errno = E2BIG;
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return -1;
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}
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minix_stack_fill(path, argc, argv, envc, envp, frame_size, frame,
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&vsp, &psp);
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/* Clear unused message fields */
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memset(&m, 0, sizeof(m));
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/* We can finally make the system call. */
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m.m_lc_pm_exec.name = (vir_bytes)path;
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m.m_lc_pm_exec.namelen = strlen(path) + 1;
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m.m_lc_pm_exec.frame = (vir_bytes)frame;
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m.m_lc_pm_exec.framelen = frame_size;
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m.m_lc_pm_exec.ps_str = (vir_bytes)(vsp + ((char *)psp - frame));
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(void) _syscall(PM_PROC_NR, PM_EXEC, &m);
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/* Failure, return the memory used for the frame and exit. */
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(void) sbrk(-frame_size);
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return -1;
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}
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